In reply to SiobhanStraver:
Tendons don't like change.
I take an extended rest of about 20 days of no climbing each year. After each and every one initially my finger middle joints are complaining and can get a bit swollen, it's just the joints' response telling you to be careful.
Unfortunately, climbing injuries, don't get fixed just by resting but really by active rehabilitation.
When you do come back after an extended period of rest your joints will be vulnerable, all of them, even the healthier ones.
What you need is an extremely gentle restart that takes weeks.
Something such as (assuming you climb routes):
1st week: Juggy 5s and 5+s only.
2nd week: Try a 6a, if it hurts more than 3/10 go back the previous line.
3rd week: Try a 6a+, once again if it hurts go back a grade.
4th week: 6b etc...
Of course the starting level will depend on your experinece in climbing etc.
After 6-8 weeks of rehabilitation chances are your fingers will feel considerably better.
Disclaimer! No physio here, just a climber, however a few years ago had a horrible joint tear that put me out for 6 months.